Pixel structure and fabrication method thereof
a technology of pixel structure and fabrication method, which is applied in the direction of electrical equipment, semiconductor devices, instruments, etc., can solve the problems of inability to meet the current market demands of light, thin, short, small and power-saving displays, and limited advantages of crts, and achieves simple fabrication process and high production yield
Active Publication Date: 2010-05-04
AU OPTRONICS CORP
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Benefits of technology
The pixel structure achieves wide view angles with a simplified fabrication process, avoiding issues of low brightness and light leakage, and enabling the production of flatter LCD panels with improved optical transmittance.
Problems solved by technology
However, for operating a plurality of terminals and / or displays on the desktop, along with the rising “environmental protection” awareness and the increasing demands for saving energy, CRTs have a limited advantage such as larger space utilization and cannot satisfy the current market demands of light, thin, short, small and power-saving displays.
However, the alignment techniques described above have the disadvantages of complicated processes and poor production yield.
As for the MVA, as alignment protrusions or slits are required to be formed on the substrates on two sides of the liquid crystal layer, an additional mask process is required, thus resulting problems such as difficulty in making LCD panels flimsier, low optical transmittance of the backlight sources, and light leakage in the dark state.
Therefore, the manufacturing cost of LCD panels is increased, and the production yield is lowered.
Method used
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[0030]Conventional twisted nematic liquid crystal must be aligned in a manner of multiple regions, such that the LCD meets the requirement of wide view angle. Therefore, in view of the disadvantages of the conventional art, the present invention provides a new pixel structure capable of achieving the effect of wide view angle and a fabrication method thereof. The pixel structure of the present invention mainly uses a TFT as a switch element, and two pixel electrodes controlled according to different charging rates, so as to achieve different effect of liquid crystal alignment. More particularly, referring to formula (1) below:
Ion=0.5×u×(W / L)×(Vgh−Vth)2 (1)
Ion is the on current; u is the electron mobility; W is the channel width; L is the channel length; Vgh is the gate driver turn-on voltage; and Vth is the threshold voltage. It can be seen from the formula that when the threshold voltage Vth changes, the on current Ion changes accordingly. Furthermore, as the Ion changes, the cha...
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A pixel structure and a fabrication method thereof are provided. The pixel comprises a substrate, a gate, a gate insulating layer, a channel layer, a first source / drain, a second source / drain, a dielectric layer, a first pixel electrode, and a second pixel electrode. The gate is disposed on the substrate and is covered by the gate insulating layer. The channel layer is disposed on the gate insulating layer above the gate. The first source / drain and the second source / drain are disposed on the channel layer. The channel layer has different thicknesses respectively corresponding to the first drain / source and the second drain / source. The dielectric layer covers the substrate and exposes the first and the second drains. The first and the second pixel electrodes are disposed on the dielectric layer, and are electrically connected to the first and the second drains respectively.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 95118961, filed May 29, 2006. All disclosure of the Taiwan application is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a pixel structure and a fabrication method thereof. More particularly, the present invention relates to a pixel structure capable of achieving an effect of wide view angle and a fabrication method thereof.[0004]2. Description of Related Art[0005]The rapid progress of the multimedia society relies much on the remarkable improvement of semiconductor devices or human-machine display devices. As for displays, cathode ray tubes (CRT) have occupied the market for many years due to its advantageous high display quality and low cost. However, for operating a plurality of terminals and / or displays on the desktop, along with the rising “environmental protection” awareness ...
Claims
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IPC IPC(8): H01L27/16H10N19/00
CPCH01L29/78696H01L27/1214H01L27/1288G02F1/1343G02F1/136G02F1/133
InventorWANG, CHING-YI
OwnerAU OPTRONICS CORP